Interactive grammar exercise (subject - verb agreement) from “The King’s Doctor” a.k.a “Horse Doctor” Part 2

The plan to save Kwang-hyun ______ all wrong because Myung-hwan never really intended to save him.
1. goes
2. go
Everyone ______ thinking that Kwang-hyun drowned in the river during the thunderstorm.
1. begins
2. begin
After the new hospital building is finished, Jinyung and Inju ______ to continue Dr. Ko’s vision.
1. decide
2. decides
Kwang-hyun finds out that the famous doctor Dr. Ko wanted him to find ______ the same doctor who treated him and his horse Yongdal years ago.
1. is
2. are
Jinyung has set up a secret pharmacy that ______ against Myung-hwan’s hospital by providing low-priced medicinal herbs to Joseon’s commoners.
1. works
2. work
Kwang-hyun, Dr. Saam, and Kayong ______ into the house to look at the woman’s condition.
1. sneak
2. sneaks
Myung-hwan and the Joseon medical entourage ______ at the capital.
1. arrive
2. arrives
Princess Sukhwi ______ her freedom in living outside the palace.
1. has been enjoying
2. have been enjoying
But Kayong's speech and mannerism ______ when she meets Sungha again.
1. change
2. changes
Myung-hwan and the medical entourage ______ triumphantly (not knowing that the Empress had not been cured by Myung-hwan).
1. arrive
2. arrives